How PFAS Enters Agricultural Water Systems
Agricultural PFAS contamination occurs through three main pathways: irrigation with PFAS-containing surface water or groundwater, application of PFAS-contaminated biosolids (sewage sludge) as fertilizer, and use of AFFF at nearby military or industrial facilities that contaminated local groundwater. Farms situated near any of these sources face potential PFAS contamination in their irrigation water, soil, and livestock water supplies.
PFAS contamination has been documented on farms in Maine, Michigan, Michigan, Vermont, and multiple other states, leading to quarantines of livestock, destruction of crops, and significant financial losses for farming families. In some cases, farmers applied biosolids for decades without knowing they contained PFAS, and contamination has persisted in soil for years after application stopped.
PFAS Uptake in Crops and Livestock
Plants absorb PFAS from contaminated soil and water through roots, with uptake varying by compound and plant species. Short-chain PFAS are generally more mobile and bioavailable than long-chain compounds. Leafy vegetables, root vegetables, and legumes show the highest PFAS concentrations when grown in contaminated soil.
Livestock consuming contaminated water and forage accumulate PFAS in meat, milk, and eggs. Cattle on PFAS-contaminated Maine farms have been found with PFAS levels in milk exceeding state action levels, triggering milk purchase restrictions and compensation programs. Blood PFAS levels in livestock correlate with water and feed contamination levels.
Filtration and Remediation Options
For farm water supplies, reverse osmosis systems sized for irrigation volumes are technically effective but expensive for large-scale agricultural use. Point-of-use RO for livestock drinking water and farm household water is more economically feasible as an interim measure.
Soil remediation for PFAS-contaminated farmland is limited by available technologies and cost. Phytoremediation — using plants to extract PFAS from soil — is under investigation but years from practical application. Regulatory programs providing compensation and transition assistance for affected farmers are being developed in several states.